Twitter is one of the most popular social networking tools used today, it is used for personal use, business use, and for non profit use. It's rise amongst 25-45 year olds is astounding. It is still pretty uncommon for teenagers, and older adults to use the service. It has gained popular notoriety because of Celebrity, and Mainstream Media use of the service.
"Twitter is a succession of chirps as uttered by birds.
Twitter is a social networking application that enables its users to send and read other users' updates known as tweets. " via Google